Class description JavaDoc for DefaultStreamCallbacks (#255)

* Class description for -DefaultStreamCallbacks

* Add package-info for the streaming package

* Typo: submit

* Add streamName to the example log

Author: sirknightj

src/main/java/com/amazonaws/kinesisvideo/streaming/DefaultStreamCallbacks.java

@@ -6,6 +6,40 @@
 
 import javax.annotation.Nonnull;
 
+/**
+ * No-op implementation of stream callbacks. Extending this class allows convenient
+ * implementation of certain callbacks while leaving the rest as no-op.
+ *
+ * <p>For example:</p>
+ *
+ * <pre>
+ *StreamCallbacks streamCallbacks =
+ *    new DefaultStreamCallbacks() {
+ *        &#64;Override
+ *        public void fragmentAckReceived(final long uploadHandle, &#64;Nonnull final KinesisVideoFragmentAck fragmentAck) throws ProducerException {
+ *            super.fragmentAckReceived(uploadHandle, fragmentAck);
+ *
+ *            // Stop submitting frames on user errors
+ *            if (fragmentAck.getAckType().getIntType() == FragmentAckType.FRAGMENT_ACK_TYPE_ERROR &amp;&amp;
+ *                4000 &lt;= fragmentAck.getResult() &amp;&amp; fragmentAck.getResult() &lt; 5000) {
+ *                log.error("{} - Received an error ack: {}", streamName, fragmentAck);
+ *                mediaSource.stop();
+ *
+ *                // Other logic...
+ *            }
+ *        }
+ *
+ *        &#64;Override
+ *        public void streamErrorReport(final long uploadHandle, final long frameTimecode, final long statusCode) throws ProducerException {
+ *            super.streamErrorReport(uploadHandle, frameTimecode, statusCode);
+ *            log.error("{} Encountered a streaming error with status code: 0x{}", streamName, Long.toHexString(statusCode));
+ *            mediaSource.stop();
+ *
+ *            // Other logic...
+ *        }
+ *    };
+ *</pre>
+ */
 public class DefaultStreamCallbacks implements StreamCallbacks {
     @Override
     public void streamUnderflowReport() throws ProducerException {

src/main/java/com/amazonaws/kinesisvideo/streaming/package-info.java

@@ -0,0 +1,4 @@
+/**
+ * Concrete implementations of {@link com.amazonaws.kinesisvideo.producer.StreamCallbacks}.
+ */
+package com.amazonaws.kinesisvideo.streaming;